Feed tebstegen



(No Model.) y l P. TERSTEGEN..

Bow SPRING PoR BYEG'LASSES. r No; 244,686. Patented July 1-9, 18A81.-

UNITED STATES PATENT OFFICE.

FEED TEESTEGEN, E ELIZABETH, NEW JERSEY.

BOW-SPRI NG FOR EYEGLASSES.

SPECIFICATION forming part of 'Letters Patent No. 244,686, dated July 19, 18.81. i Application filed January 17', 1881. (No modeLl To all whom t may concern.:

Be it known that I, FRED TERsTEGEN,'of Elizabeth, in the county of Union and State of New Jersey, have invented a new and Improved Spring forEyeglasses, of which the following is a specification.

The objectot' my invention is to provide a new and improved eyeglass which can be closed without contracting the spring and without requirin g one glass to pass along the other. The invention relates to eyeglasses with a divided bow-spring; and it consists in making the spring of a iiat piece of steel and forming an extension on each section beyond the rivetfso that a corresponding projection and indentation may be made to lock the ends on both sides of the rivet. The two sections are thus held rigidly together when the glasses are in use, but will require but slight force to unlock them whenthey are to be folded together.

- In the accompanying drawings, Figure l is a side view of an' eyeglass provided with my improved hinged spring, the eyeglass being open. Fig. 2 is a plan view of the same, showing it halt-closed. Fig. 3 is a plan view of the sanne, showing it entirely closed. Fig. 4 is a detail longitudinal sectional elevation through the middle of my improved hinged eyeglassspring.

Similar letters of reference indicate correy spending parts.

ping ends of these strips or extensions.

`serveto hold the spring in position when the glass is open, and they may be replaced by any analogous device that will accomplish the same.

The operation is as follows: It' the. eyeglass is open,as shown in Fig. 1, the projections F F of the strip rest in the recesses or notches G G 'of the strip B, as` shown in Fig. 4, and thus' hold these two strips in onestraight line. If

the eyeglass is to be closed the pivot C wilLbe l the center of rotation, andthe two glasses D and E will swing `toward each other, as shown in Fig. 2', and will finally lie close against each other, as shown in Fig. 3. The eyeglass can thus be closed without contracting the spring,

and the pins and hooks formerly required to lock the eyeglass in position when closed are no longer required. The within-described construction of the spring is applicable to any'kind of spring-eyeglass, and will be of special advantage i'n those glasses having either plain or stationary noserests, for these nose-rests and the springs are very apt to be broken if the glass is closed as heretofore, but cannot be damaged if closed by swinging the glasses 'sidewise toward each other, as I have described FEED TEESTEGEN.

Witnesses:

OseAR F. GUNZ, C. SEDGWICK. 

